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  #16  
Old November 28th, 2017, 06:38
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Re: Yet another heat issue

today was 20 out engine temp stayed around 179-182

i did notice when i switch from vent to heat my thermometer got stuck in the blend door and the heat coming out of the vents was a few degrees hotter.

does the heat to vent do anything other than move the blend door?
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  #17  
Old November 29th, 2017, 07:48
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Re: Yet another heat issue

Quote:
Originally Posted by 90xj06 View Post
does the heat to vent do anything other than move the blend door?
nope
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  #18  
Old November 29th, 2017, 14:38
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Re: Yet another heat issue

Just because the blend door is moving doesn't mean it is doing its job. that was part of the issue I had with my heat was the old blend door wasn't sealing up and letting cold air in. Check out Heatertreater, they make steel blend doors for XJs
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  #19  
Old December 7th, 2017, 09:51
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Re: Yet another heat issue

so i went through the FSM and apparently when the selector is in the vent postion the heater water valve is CLOSED. this would cause the heat to be sucky. in all other positions the valve is open unless in full cool mode. this explains why the heat was at 144 in bi-level a/c mode. i might go cap the vacuum line for the valve until spring.
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  #20  
Old December 8th, 2017, 06:32
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Re: Yet another heat issue

Quote:
Originally Posted by sinat01 View Post
Just because the blend door is moving doesn't mean it is doing its job. that was part of the issue I had with my heat was the old blend door wasn't sealing up and letting cold air in. Check out Heatertreater, they make steel blend doors for XJs
does this still apply to an 88? im pretty sure i have steel doors but the sealing could be an issue.

also, in 91 they changed the heater controls to allow the water valve to operate in all modes. and i have one from a 93 so my valve does work.

so any one with a renix and bad heat performance in vent mode might want to give this a check.
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  #21  
Old December 8th, 2017, 08:32
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Re: Yet another heat issue

Most also remove the useless heater control valve so water is flowing through the heater core all the time like in the newer models.
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  #22  
Old December 8th, 2017, 11:10
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Re: Yet another heat issue

i want to try and avoid removing it.
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